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authorDavid S. Miller <davem@davemloft.net>2009-09-27 08:23:41 +0400
committerDavid S. Miller <davem@davemloft.net>2009-09-27 08:23:41 +0400
commit7eebda60d57a0862a410f45122c73b8bbe6e260c (patch)
tree2450ccca0bd7fc21526d2900a9c11a86ab9a1f39 /arch/sparc
parentd0b86480f5b33f4a86d7c106706d6e0dcd1935ce (diff)
downloadlinux-7eebda60d57a0862a410f45122c73b8bbe6e260c.tar.xz
sparc: Niagara1 perf event support.
This chip is extremely limited, and many of the events supported are approximations at best. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc')
-rw-r--r--arch/sparc/kernel/perf_event.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c
index 6f01e04cc323..9541b456c3ee 100644
--- a/arch/sparc/kernel/perf_event.c
+++ b/arch/sparc/kernel/perf_event.c
@@ -201,6 +201,121 @@ static const struct sparc_pmu ultra3_pmu = {
.lower_nop = 0x14,
};
+/* Niagara1 is very limited. The upper PIC is hard-locked to count
+ * only instructions, so it is free running which creates all kinds of
+ * problems. Some hardware designs make one wonder if the creastor
+ * even looked at how this stuff gets used by software.
+ */
+static const struct perf_event_map niagara1_perfmon_event_map[] = {
+ [PERF_COUNT_HW_CPU_CYCLES] = { 0x00, PIC_UPPER },
+ [PERF_COUNT_HW_INSTRUCTIONS] = { 0x00, PIC_UPPER },
+ [PERF_COUNT_HW_CACHE_REFERENCES] = { 0, PIC_NONE },
+ [PERF_COUNT_HW_CACHE_MISSES] = { 0x03, PIC_LOWER },
+};
+
+static const struct perf_event_map *niagara1_event_map(int event_id)
+{
+ return &niagara1_perfmon_event_map[event_id];
+}
+
+static const cache_map_t niagara1_cache_map = {
+[C(L1D)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
+ [C(RESULT_MISS)] = { 0x03, PIC_LOWER, },
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
+ [C(RESULT_MISS)] = { 0x03, PIC_LOWER, },
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
+ [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
+ },
+},
+[C(L1I)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = { 0x00, PIC_UPPER },
+ [C(RESULT_MISS)] = { 0x02, PIC_LOWER, },
+ },
+ [ C(OP_WRITE) ] = {
+ [ C(RESULT_ACCESS) ] = { CACHE_OP_NONSENSE },
+ [ C(RESULT_MISS) ] = { CACHE_OP_NONSENSE },
+ },
+ [ C(OP_PREFETCH) ] = {
+ [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
+ [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
+ },
+},
+[C(LL)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
+ [C(RESULT_MISS)] = { 0x07, PIC_LOWER, },
+ },
+ [C(OP_WRITE)] = {
+ [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
+ [C(RESULT_MISS)] = { 0x07, PIC_LOWER, },
+ },
+ [C(OP_PREFETCH)] = {
+ [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
+ [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
+ },
+},
+[C(DTLB)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
+ [C(RESULT_MISS)] = { 0x05, PIC_LOWER, },
+ },
+ [ C(OP_WRITE) ] = {
+ [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
+ [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
+ },
+ [ C(OP_PREFETCH) ] = {
+ [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
+ [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
+ },
+},
+[C(ITLB)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
+ [C(RESULT_MISS)] = { 0x04, PIC_LOWER, },
+ },
+ [ C(OP_WRITE) ] = {
+ [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
+ [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
+ },
+ [ C(OP_PREFETCH) ] = {
+ [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
+ [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
+ },
+},
+[C(BPU)] = {
+ [C(OP_READ)] = {
+ [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
+ [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
+ },
+ [ C(OP_WRITE) ] = {
+ [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
+ [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
+ },
+ [ C(OP_PREFETCH) ] = {
+ [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
+ [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
+ },
+},
+};
+
+static const struct sparc_pmu niagara1_pmu = {
+ .event_map = niagara1_event_map,
+ .cache_map = &niagara1_cache_map,
+ .max_events = ARRAY_SIZE(niagara1_perfmon_event_map),
+ .upper_shift = 0,
+ .lower_shift = 4,
+ .event_mask = 0x7,
+ .upper_nop = 0x0,
+ .lower_nop = 0x0,
+};
+
static const struct perf_event_map niagara2_perfmon_event_map[] = {
[PERF_COUNT_HW_CPU_CYCLES] = { 0x02ff, PIC_UPPER | PIC_LOWER },
[PERF_COUNT_HW_INSTRUCTIONS] = { 0x02ff, PIC_UPPER | PIC_LOWER },
@@ -753,6 +868,10 @@ static bool __init supported_pmu(void)
sparc_pmu = &ultra3_pmu;
return true;
}
+ if (!strcmp(sparc_pmu_type, "niagara")) {
+ sparc_pmu = &niagara1_pmu;
+ return true;
+ }
if (!strcmp(sparc_pmu_type, "niagara2")) {
sparc_pmu = &niagara2_pmu;
return true;